Air-compressor.



No. 850,208. PATENTED APR. 16, 1907.

E. J. BRING. AIR GOMPRESSOR.

APPLIUATIOH FILED KAY 7,1904.

2 SHEETS-SHEET 1.

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E. J. BRING. AIR COMPRESSOR.

APPLICATION FILED my 7,1904.

2 SHEETB-BHEET 2.

UNITED STATES EI A J. BRING, OF SCHENECTADY,

' J ELECTRIC ()QMPANY, A CORPORATION .OF NEW YORK.

AIR-COMPRESSOR.

To all whom it may concern: I

Be it known that I, EINAR J. BRING, a subject of the King of Norway and Sweden, re-,

siding at Schenectady, county of Schenectady, State of New York, have inventedcertain new and useful Improvements in Air- Compressors', .of which the 'following is a specification.

My invention relates to improvements in air-compressors, and has for its ob ect to provide means forfautomatically taking up. the

Q rods.

. firmly held in the dinal vertical section appear upon reference to the following taiwear of" the parts and in other respects ini' proving the arrangement and construction of the com ressor.

It .is wel known that in the employment of electrically-driven air-compressors in'railway. work 'a disagreeablevibration and noise is often caused bythe operation of the comressor; Much of this vibration isdue to ost motion caused-by wear u on the bear ings of the connecting-rod an the plunger 8,--

- and crank-pin to which it is connected.

rious means have been up this wear, so as to tion of the compressor. v

My invention comprises novel means for proposed for taking improve the operadoing thisi Q In carrying out the invention in connection with the double-actin compresor I en ploy a piston havingtwo heads arranged on opposite sides of the drivin -crank, to which t eheads are connected by twoconnectin Means are also provided for yieldingl drawing the heads toward each other, so t at at al -'In said particularly pointed pended claims-- x .rawings, Fi e 1 is a longituo bodyin the features of 2 is apTan-yiew of thexcompressor, illustrating the manner of connecting the heads -of the compressor, parts being removed and parts shownin section. a 3 is a plan view of the c0mpress'or piston;

Specification of Letters Patent. Application tiled May 7, 1904. Serial No. 206,913. I

accompanying drawings, and the scope a compressor em my invention. F1g. v

and Fig. 4 is a sec-- PATENT OFFICE.

Patented April 16, 1907.

! tional elevation of said piston,-the plane of section being indicated'by the line 4 4 of Fig. 1.

Throughout these several figures like characters refer to like parts.

The driving-motor, which is preferably an electric motor, is, inclosed within a suitable casing A, adapted to be secured to the under side of the car-body. The compressor, which is of the double-acting type, comprises a frame head or casing B, ends or heads C for said casin' alined cylinders 11, cast integral with saiil heads, and a double-headed piston D. The frame-head B is removably secured to the end of. the motor-casing A by bolts 'assin provi ed wit a bearing 1.4 forone end of the driving-shaft 15. T1118 shaft .is provided with a crank-pin 16, which extends beyond the, bearing 14 into the interior of the casing B. The compressor-heads C areremovably secured to the casing B by bolts '17 and are provided with inlet-valves 18, ,outlet valves Y19, and outlet-passages 21, which communicate with the common deliver .-pipe 22, the ends of which are secured to t bolts 23; Thus it will be apparent'that at any time either head C-mag be readily removed by simply removing,

the compressor. The piston D comprises-two heads 24 24,- which are adapted toreciprocate 1n the cylit through the outlet-valves '19 and the passage 21 to the delivery-pipe 22. Each piston-head is part Df a casting which includes '-a spring-case 25', a projection 26, and a strengthenin -b'race 29. The spring-case of 'elding connection, e

com ression-springs 28. The bolts pass free y through openings in the pro ections 26 through spring-cases 25 and are-surrounded b the coiled springs 28 in the sprm Pcases. '1 e head of each bolt bears against t e. 'robears at its opposite end against the interior The cran tends into through the flange 12 and is e heads C by olts 23 and 17, thereby permitting access to the interiorof iston-heads toward each other, is provide by bolts 27 and NEW YORK, ASSIGNOR TO GENERAL.

inders 1 1 and to com ress the air which is admitted through the inlet-valves 18 and force each casting les adjacent tothe projection of i ction "26, and a nutatthe. other en re ceiives the thrust of the spring 28, which m5 1 of the spring-case, as .'clearly illustrated.

-pin'16 of the driving-shaft exy the space-betweenthe braces 29' designed to hold tomatically .ta

bolts 27- of the sp and will ordinarily sti l I the minimum restraining power is required ther, it wi lbe 45 and through the connecting-rods 30 trans mits its motion to the piston. These connecting-rods are provided at opposite ends with bearings which at their inner ends abut against the crank-pin 16 and at their outer vided with an opening 34 and a cover 35' therefor. Through this opening access may be had to the interior of the compressor for the purpose of adjustment and renewal of the parts therein. The lower side of this casing B is also rovided with the basin 36,

ubricating-oil, which isjdistributed to the wearing parts of the compressor by means of a pump 37 This pump constitutes the subject-matter of a separate application filed by me, and its operation not being necessary to an understanding of the present invention need not be described erein.

' In the operation ofl'the compressor it will be-app'arent that any wear which may occur between the bearings of the connecting-rods.

and the crankin or the wrist-pins willbe auen up by the s rings 28, which by drawingthe 1ston-hea s toward each other always ho d the connecting-rods in place, and thereby prevent pounding. In order to prevent the. heads 24 striking the end of the cylinders 11 in case any of the springs should break, I provide each of the ring connection between the piston-heads with a bushing. 28, which is of such length that when the connecting-rods are horizontal it will just engage the interior of the spring-casing25, and thereby prevent further se aration of the 'iston-heads. Fura parent t .at a broken spring will not be wli olly useless, but that the broken parts will ex possess enough power to practicallyperform their function. The s rmgsare at no time subjectedto the strain ue tothe compression of the air; but these strains are taken up by the connecting-rods. The maximum load on the springs occurs when the compressor is pum ing against no pressure, since at that tune t ere is nothing ut the springs to resist the momentum of the iston at theendsof its stroke. It will also noted that at the end of each stroke, which is the oint where the greatest power is required to old the piston-heads together, the springs areat thelr maximum compression, while at the middle of the strokev when the springs are at their minimum compression. This -arrangement thus permits a and into engagement 5 most efficient operation, since the springpressure conforms throughout to the operai tive conditions, and springs of minimum size may be employed.

1t will be apparent to'those skilled in the art that many alterations and'modifications may be made in the construction herein disclosed without departing from the spirit and scope ofmy invention. -I therefore do not desire to limit myself to the particular construction' shown, but aim to cover by the terms of the appended claims all such alterations and modifications.

by Letters Patent of the United States, is

l. The combination of two piston-heads, elastic means, connecting said piston-heads and tending to draw them together, a bearing in each head, a crank-pin between said bearings, and a connecting-rod located bepin and held in position by said elastic means.'

2. The combination of two iston-heads,a

said bearings, a pair of connecting-rods each loosely engaging one of said bearings and saidcrank-pin, and an elastic connectlon between said together.

3. The combination oftwo piston-heads,

other, a drlving-shaft located between said heads, and transmitting'means between said shaft and heads including a pair oficonnecting-rods connected so that the wearof the parts is automatically taken up by the said elastic means.

4. The combination of two piston-heads, elastic means connecting said heads to ether and tending to draw said heads toward each other, a driving-crank located between-said heads, and connecting-rods compressed between said crank and said elastic means. I

5. The combination of two piston-heads, a

aw them together, a driving-crank located between saidheads, and two connecting-rods bearing at their inner ends against the crankin and at their outer ends against said eads.

6. The combination with an electric motor. and a crank driven thereby, of an air-comr'essor .comprising a double-acting piston aving two heads, a spring connecting said heads and tending to draw them together, and connecting rods between said crank and piston located so as to have the wear of their parts taken up automatically by said springs. 7. The combination of a double p ston made u of two castings each comprising one pistonead and a spring-case formed lntetween each of said bearings and the crankbearing in each head, a "cran -pin between,

elastic means connecting said heads to other and tendi'n to draw said heads towar each said piston-heads by slpring connecting said. heads and tending to r What I claim as new, and desire to secure piston-heads for holding the parts cameos gral therewith, springs located in saidcases and arranged to draw the parts of the piston toward each other, and driving means connected with said piston so that the wear of the parts is automatically taken up by said springs.

8. The combination of a double-headed piston, a driving-crank located between the piston-heads, bearings on said heads, connecting-rods extending and bearings, and springs extending'between said bearings and elastically pressing said bearin into engagement with the connecting-r0 so as to automatically take up wear.

9. The combination of two piston-heads, elastic means tending to draw said heads toward'each other, driving means located between said heads and-operating to separate between said crank crank, and stops arranged to of that nee ed by the con.-

said heads against the action of said elastic means durin their reciprocation, and means for limiting tire amount of separation.

10. The combination of two pistonheads, a spring connection between sald heads'tending to draw them together, a driving-crank and connecting-rods located between said heads, acting'to separate said heads against the spring tension during the rotation of the revent a separation in excess necting-rods. I

In witness whereof I have hereunto set my 5 hand this 6th day of May, 1904. E-INAR- J. BRING.

Witnesses:

l y BENJAMIN B. HULL,

HELEN Onrom). 

